3 // Copyright (C) 2000, 2001, 2002, 2003, 2009 Free Software Foundation
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // You should have received a copy of the GNU General Public License along
17 // with this library; see the file COPYING3. If not see
18 // <http://www.gnu.org/licenses/>.
20 // 27.6.1.3 unformatted input functions
21 // NB: ostream has a particular "seeks" category. Adopt this for istreams too.
22 // @require@ %-*.tst %-*.txt
23 // @diff@ %-*.tst %-*.txt
25 // { dg-require-fileio "" }
30 #include <testsuite_hooks.h>
35 typedef std::istream::off_type off_type;
37 bool test __attribute__((unused)) = true;
38 std::istream::pos_type pos01, pos02, pos03, pos04, pos05, pos06;
39 std::ios_base::iostate state01, state02;
40 const char str_lit01[] = "istream_seeks-1.txt";
41 const char str_lit02[] = "istream_seeks-2.txt";
42 std::ifstream if01(str_lit01, std::ios_base::in | std::ios_base::out);
43 std::ifstream if02(str_lit01, std::ios_base::in);
44 std::ifstream if03(str_lit02, std::ios_base::out | std::ios_base::trunc);
45 VERIFY( if01.good() );
46 VERIFY( if02.good() );
47 VERIFY( if03.good() );
49 std::istream is01(if01.rdbuf());
50 std::istream is02(if02.rdbuf());
51 std::istream is03(if03.rdbuf());
60 // istream& seekg(pos_type)
61 // istream& seekg(off_type, ios_base::seekdir)
64 // NB: see library issues list 136. It's the v-3 interp that seekg
65 // only sets the input buffer, or else istreams with buffers that
66 // have _M_mode == ios_base::out will fail to have consistency
67 // between seekg and tellg.
68 state01 = is01.rdstate();
69 is01.seekg(10, std::ios_base::cur);
70 state02 = is01.rdstate();
72 VERIFY( pos01 == pos02 + off_type(10) );
73 VERIFY( state01 == state02 );
75 VERIFY( pos02 == pos01 );
77 state01 = is02.rdstate();
78 is02.seekg(10, std::ios_base::cur);
79 state02 = is02.rdstate();
81 VERIFY( pos03 == pos04 + off_type(10) );
82 VERIFY( state01 == state02 );
84 VERIFY( pos03 == pos04 );
86 state01 = is03.rdstate();
87 is03.seekg(10, std::ios_base::cur);
88 state02 = is03.rdstate();
90 VERIFY( pos05 == pos06 + off_type(10) );
91 VERIFY( state01 == state02 );
93 VERIFY( pos05 == pos06 );
96 state01 = is01.rdstate();
97 is01.seekg(20, std::ios_base::beg);
98 state02 = is01.rdstate();
100 VERIFY( pos01 == pos02 + off_type(10) );
101 VERIFY( state01 == state02 );
102 pos02 = is01.tellg();
103 VERIFY( pos02 == pos01 );
105 state01 = is02.rdstate();
106 is02.seekg(20, std::ios_base::beg);
107 state02 = is02.rdstate();
108 pos03 = is02.tellg();
109 VERIFY( pos03 == pos04 + off_type(10) );
110 VERIFY( state01 == state02 );
111 pos04 = is02.tellg();
112 VERIFY( pos03 == pos04 );
114 state01 = is03.rdstate();
115 is03.seekg(20, std::ios_base::beg);
116 state02 = is03.rdstate();
117 pos05 = is03.tellg();
118 VERIFY( pos05 == pos06 + off_type(10) );
119 VERIFY( state01 == state02 );
120 pos06 = is03.tellg();
121 VERIFY( pos05 == pos06 );